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If you forget the administrator password and don't have a password reset disk or another administrator account, you won't be able to reset the password. If there are no other user accounts on the computer, you won't be able to log on to Windows and will need to re-install Windows.
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All PC's Have A Jumper Some Ware Next To The Bios Chip
On The Main Board That Can Be Moved From One Posision
To The Other And Back Again After You Turn Off And Un Plug
The PC And All Devices Attached To It !

This Re Sets Every Thing In The Bios Including The Password
for the PC! Consult The Manual For The PC !

If you have already have one, so just do as below:Here are the steps to use the disk for your password recovery.Step 1: If you enter the wrong password when you attempt to log on, Windows will display a message that the password is incorrect. Click "OK" to close the message box.Step 2: Click "Reset Windows Password", and then insert Windows password reset disk (or other removable media).Step 3: Follow the steps in the "Password Reset Wizard" to create a new password.Step 4: Log on with the new password.

Unless you are comfortable with using software such as Billix, or ERD Commander to set the Administrator password to blank. It would probably be easier to reinstall the OS. It would probably be good to do that anyway, because you don't know what was left on there by the previous owner. Might have Viruses or other nasty stuff.

If you have another account on your laptop that has administrator rights, log in into that account and change the password for your account. If you have an administrator account (even if you don't try putting in Administrator and leave password field blank) try using that account to reset the password, otherwise try one of the following:

- see this http://windows.microsoft.com/en-us/windows-vista/What-to-do-if-you-forget-your-Windows-password- or if anything else didn't work you can use thrid party software from Hiren's Boot CD to reset the password http://www.hirensbootcd.org/download/Hirens.BootCD.12.0.zip